This question already has an answer here:
According to this answer:
Almost all Japanese characters (in my experience >99%) are exist in Chinese. Few are changed a little, like 宮 and 宫. As a Chinese, I have no difficulty in recognizing Japanese characters.
Now, I wonder which character is what was invented in Japan, or maybe imported from Korea but not originally from China, if any.
Is there any research regarding this area or is there such compiled list?